Tread portion of an automobile tire



FIG. 1 is a perspective view of a tread portion of an automobile tire showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a fragmentary enlarged front view surrounded by line A-A and B-B in FIG. 2; and,

FIG. 7 is a section view taken along line 7-7 in FIG. 6.

The broken lines are for the purpose of showing environmental structure only and form no part of the claimed design. 

CLAIM The ornamental design for a tread portion of an automobile tire, as shown and described. 